- From: Elena Litani <hlitani@jtcsv.com>
- Date: Sun, 04 Feb 2001 15:52:08 -0500
- To: xmlschema-dev@w3.org
Hi, Are list/union datatypes considered to be 'atomic datatypes'? Specs are not clear. According to [2.5.1.1 Atomic datatypes]: "atomic datatypes can be either primitive or derived." I would assume that list and union are atomic datatypes (since both are derived). However, if I read [2.5.1 Atomic vs. list vs. union datatypes], I would assume that list and union are not atomic datatypes. But note from Henry, seems to say that union might be atomic if union's members are also atomic...? I am truly confused. Can you clarify, please? Thank you, Elena -------- Original Message -------- Subject: Re: List and union varieties Resent-Date: Fri, 2 Feb 2001 07:25:35 -0500 (EST) Resent-From: xmlschema-dev@w3.org Date: 02 Feb 2001 12:25:14 +0000 From: ht@cogsci.ed.ac.uk (Henry S. Thompson) To: Michael Anderson <michael@research.canon.com.au> CC: "xmlschema-dev@w3.org" <xmlschema-dev@w3.org> References: <3A7661ED.3CF12466@research.canon.com.au> Michael Anderson <michael@research.canon.com.au> writes: > Hi all, > I was wondering if a simple type can be a list of a simple type that has > a variety of union. The specifications seem inconsistent. > > http://www.w3.org/TR/xmlschema-1/#cos-st-restricts says > If the variety is list: > 2.1 The item type definition must have a variety of atomic or union .... > > while http://www.w3.org/TR/xmlschema-2/#atomic-vs-list says > [ Definition:] List datatypes are those having values each of which > consists of a finite-length sequence of values of an atomic datatype. The _values_ must be atomic, but that atomicity may be acquired via a union type, provided the union's members are also atomic, if you see what I mean. ht -- Henry S. Thompson, HCRC Language Technology Group, University of Edinburgh W3C Fellow 1999--2001, part-time member of W3C Team 2 Buccleuch Place, Edinburgh EH8 9LW, SCOTLAND -- (44) 131 650-4440 Fax: (44) 131 650-4587, e-mail: ht@cogsci.ed.ac.uk URL: http://www.ltg.ed.ac.uk/~ht/
Received on Sunday, 4 February 2001 15:51:41 UTC